The best example of an abstract class is GenericServlet . GenericServlet is the parent class of HttpServlet . It is an abstract class.
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A concrete example of an abstract class would be a class called Animal . You see many animals in real life, but there are only kinds of animals. That is, you never look at something purple and furry and say “that is an animal and there is no more specific way of defining it”.
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An abstract class is a class that is declared abstract —it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.
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Abstract classes are essential to providing an abstraction to the code to make it reusable and extendable . For example, a Vehicle parent class with Truck and Motorbike inheriting from it is an abstraction that easily allows more vehicles to be added.
Read moreWhat is abstraction in Java with example?
Abstraction in Java Abstraction is a process of hiding the implementation details and showing only functionality to the user . Another way, it shows only essential things to the user and hides the internal details, for example, sending SMS where you type the text and send the message.
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